They do rescue the hooded man, revealed to be Simpson Flanders, who has certainly seen better days.

Mr. Scratch’s plans come to an abrupt halt, when the Joker single-handedly wipes out his men. He has no interest in any newbies claiming Gotham.

Nightwing and Robin discover Wayne Manor gone, plowed into the cave. The Return of Bruce Wayne storyline, much more recently, would amend this, that only one wing of the manor was destroyed at this point. But that clearly goes against what is shown here, so I view that as being the result of Superboy punching a wall.